Pulley.



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P. MARQUA. PULLEY. APPLICATION FILED DEC. H. 1914- I Patented Oct. 26,191-5.

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W1 IWESSES P/w/zp fizz/741a PHILIP MARQUA, OF ST. LOUIS, MISSOURI.

PULLEY.

Specification of Letters Patent.

Patented (Jet. 26, 1915.

Application filed December 11, 1914:. Serial No. 876,683.

To all whom it may concern:

Be it known that I, PHILIP MARQUA, citizen of the United States,residing at St. Louis, State of Missouri, have invented certain new anduseful Improvements in Pulleys, of which the following is a full, clear,and exact description, reference being had to the accompanying drawings,forming a part hereof.

My invention has relation to improvements in pulleys; and it consists inthe novel features of construction more fully set forth in thespecification and pointed out in the claims.

In the drawings, Figure 1 is an end elevation of a pulley made accordingto my invention; Fig. 2 is a peripheral elevation thereof; Fig. v3 is amiddle vertical transverse section thereof on the line 33 of Fig. 2;Fig. 4 is a view similar to Fig. 2 with one of the rim sections removedhowever to expose the hub within, parts being broken; Fig. 5 is aninside plan view of one of the rim sections; and Fig. 6 is an endelevation of a modified form of pulley, the view being a mere outlineone.

The present invention is specially directed to wood pulleys, and tosplit wood pulleys in particular, and has for its object to construct awood pulley with a minimum waste of material; one whose constructionentails a minimum amount of labor; one which is fool-proof so that anyordinary workman can apply it to the shaft on which it is to be mounted;one which is perfectly balanced; one .which does not shrink in a way toproduce distortion or warping, so

that the pulley always retains its proper.

shape; one in which the rim is removable from the hub portion, therebyallowing free and ready access to the bolts by which the,

sections of the hub (which embrace the shaft) are held together andgripped to the shaft; one permitting the use of woods of proper varietyfor the hub and rim sections respectively whereby a maximum grip may behad on the shaft; one which. is readily applied, or removed from theshaft, and one possesing further'and other advantages better apparentfrom a detailed description of the invention, which is as follows.

Referring to the drawings, and for the present to Figs. 1 to 5inclusive, 1, 1,'represent two sections or halves forming the hub of thepulley when assembled, the hub being rectangular and preferably oblongin crosssection, each half or member 1 being formed with asemi-cylindrical bore or groove so that when the two halves areassembled they form a cylindrical opening P for the shaft S to which thepulley is attached. By virtue of the oblong cross-section of the hubthere result the contiguous faces a, b, the opposite faces a being thelarger and the faces 5 the smaller, the respective faces being disposedat right angles to one another and meeting along edges 6 disposedparallel to the axis of the hub and the axis of the shaft coincidenttherewith. As shown in the drawings, the hub sections are separablealong a central plane passing through the axis of the hub and parallelto the larger faces a, a. The hub being oblong in cross-section (and notsquare), it follows that the thickness of the material between the faces6, b, and the bounding walls of the opening P, measured along-the linesm is greater than the thickness between the faces a, a, measured alongthe lines y, 3 thus leaving an excess of material at the ends of theoblong cross section of the hub. This excess while not indispensable isdesirable to provide ample material for the securing screws by which thedetachable rim sections are fastened to the hub. When the sub sectionsare assembled they are secured to one another by the carriage boltsQ, 2,driven through the hub sections on opposite sides of the axis of the huband across the plane of separation of the sections, the bolts beinginserted from opposite directions so that the heads h, h, thereof arediagonally opposite to one another, and the washers 'w and clamping nutsn are likewise diagonally opposite to one another. The ends of the boltscarrying the nuts 01. and washers to being the weighted ends, it followsthat the hub (and hen e the pulley) will be perfectly balanced. Thebolts 2, 2, are preferably disposed in a centraltransverse planeintersecting the axis of the hub, that is to say, the axes of the boltsare in a common transverse plane equidistant from the ends of the hub. ji

In the present embodiment of my invention, I form the rim R of fourdetachable sections 3, 3, 3, 8, the opposite sections 3, 3, beingprovided with depressions or pockets (2 to receive the heads h of thebolts, and the opposite sections 3, .3, being provided with largerdepressions or pockets 0?, d, to receive the nuts a. Passed through eachsection 3, 3, on opposite sidesof the plane of disposition of the bolts9 Q are securing screws l, 4', the same beingdirected into thehub-sections through th edges or ridges e ina direction to substantiallybisect the angle between the faces a, b. The screws alare driven intothe rim sections below the perlpheral surfaces thereof,'the sockets thusremaining being filled by wooden plugs 5 flush with the surface of therun as shown.

:The hub' is preferably composed of hard faces of the'rim sections arepreferably (though not necessarily) plane, and leading from said facesare grooves m the walls of which are disposed at right angles to oneanother so as to engage the faces a, o, of the hub. The'said inner facesof the rim sec tions collectively form rectangular prism,

the planes of :whose faces intersect the faces a, b, leav ng triangularprismatic openings O, O, the, openings 0 being the larger andcorrespondingly positioned diagonally opposite one another, the diagonalopenings 0 being opposite the plane of separation between the hubsections. Of course were the inner faces of the rim'sections other thanplane, the shape of the passages or openings 0, 0, would. be i changed.The opposite walls of the grooves m are substantially the same in widthso that they engage the faces ,a, b,.of the hub throughout equal arealportions from theridges e to the inner edges of said. walls.

Owing to the fact that the inner faces of the rim sections form thefaces of a prism which is square in crosssection and the faces a, b, ofthe hub form a prism which is oblong in cross-section, the portions t(Fig. 3) of the inner faces of the rim sections out of engagement withthe faces a of'the hub, will be wider than the portionst which areout'ofengagement with the hub faces Z). The unequal width of the portions 6,t, gives rise to the unequal sizes of the passages or openings 0, 0.

By this arrangement however, another object is subserved, which is,'thatthe pulley is fool-proof"; that is to say, an unskilled mechanic canapply the members 8, 3, without danger of placing them on wrong, the

unequal face sections 6, 6, making these.

members nonreversible so that they can be fitted only one way. It maybe'stated in passing that the ends of the bolts 2, 2, adjacent the heads7, k, thereof have a tight or drive fit through the particular hubsection which carries the bolt, the opposite end of the belt or thatcarrying the screw-threads being loosely received by the oppositesection of the hub.

In applying the pulley to a shaft S, the bolts 2, 2 are first driveninto their respective. hub sections as described, and the rim sections3, 3, are secured in position to said hub sections. The hub sections arethen applied to the shaft from diametrically opposite directions andbrought together so as to embrace the shaft, the threaded ends of thebolts passing freely through the opposing sections of the hub. Thereuponthe engineer or workman applies the washers w and nuts 11. to theprojecting ends of the bolts, and by driving home the nuts, draws thehub sections together and causes the same to tightly grip the peripheralwalls of the shaft. To insure this result the opening 1 through whichthe shaft passes must be slightly smaller than the circumference of theshaft so as to insure a firm grip. By nowturning the shaft (with the huband its two rim sections clamped thereto) for the convenience of theoperator so as to bring in front of him successively the two remaininggaps. of the rim to be completed, he merely deposits the remainingsections 3, 3, into their proper places, drives home the screws 4 andthe pulley is completed, with the exception of inserting the plugs 5which is readily done. To remove a pulley, the rim sections 3', 3, arefirst detached, thereby according access to the nuts n of the bolts 2,and by unscrewing the nuts, the hub sections may be readily parted, thebolts which have a drive lit in one section fitting loosely in theopposing section as described, so that the detaching of a pulley from,or the mounting of the same upon, a shaft is accomplished in a minimumloss of time.

I do not of course wish to be restricted to the number of sections ofeither the hub or rim, as'these may be varied without a departure fromeither the nature or spirit of my invention; and in Fig. 6 I show anoutline of a pulley having only two rim sections 3", 3, the remainingportions of the pulley being substantially as those already described.In fact, the pulley may be changed. in many minor details withoutaffecting the invention or principle thereof as here described.

By reference to Fig. 1 it will be seen that the grain of the wood on thehub runs toward the ends of the longer faces of the oblong cross-sectionof the hub, the grain of the wood of the rim sections running transverseto the general direction of the grain of the hub. This tends to preventsplitting, and results in the formation of a strong and durable pulley.

Having described my invention, what I claim is:

1. A wood pulley comprising a central hub composed of two sectionsadapted to jointly embrace a suitable supporting shaft, and an outer rimcomposed of two or more sections each in interlocked relation with twocontiguous outer faces of a section of the hub, whereby the hub and rimare rotatable as a unit about a common axis.

A pulley comprising a hollow hub composed of two sections securedtogether, the outer bounding walls of the hub forming a polygon incross-section, and a rim comprising a series of detachable sections eachembracing the hub about the contiguous faces forming an angle of thepolygon, whereby the rim sections are locked to the hub sections androtate as a unit therewith.

3. A pulley comprising a sectional hub polygonal in cross-section, and asectional rim detachably secured to the hub, the inner walls of eachsection of the rim bearing against the outer faces of the hub at pointscontiguous to the vertices of the angles formed by said faces.

4. A wood pulley comprising a sectional hub having a central tubularbore and faces surrounding the tubular portion and meeting to impart anouter polygonal crosssection to the hub, an outer sectional rimencompassing the hub, each section of the rim being recessed to receivethe corner formed by two meeting faces on the polygonal portion of thehub, whereby the hub and rim sections are interlocked and operate torotate as a unit.

5. A pulley comprising a central hub substantially rectangular andoblong in crosssection, the grain of the wood running toward the ends ofthe longer face of the hub, and an outer wooden rim composed of sectionsrecessed to receive the several corners of the hub, with the grain ofthe sections running transverse to the general direction of the grain ofthe hub as aforesaid.

6. A pulley comprising a central hub substantially rectangular incross-section, and a detachable rim composed of sections each engagingthe hub along portions of contiguous faces from the meeting edges ofsaid faces to points suitably removed from said edges.

7. A pulley comprising a central hub polygonal in cross-section, and adetachable sectional rim encompassing the same, each section engagingportions of contiguous faces of the hub from the meeting edges of saidfaces to points suitably removed from said edges.

8. A wood pulley comprising an inner hub oblong in cross-section andcomposed of two sections separable along a central plane between thelonger sides of the oblong, a series of detachable rim sectionsencompassing the hub and collectively forming a. continuous rim for thepulley, the inner faces of the rim sections being grooved to receive thecorners of the hub, the walls of the grooves engaging the hub facesforming the corners, from the meeting edges of the faces to suitabledistances from said edges, securing devices passed through the rimsections and through the corners of the hub, and securing devices passedthrough the hub sections transversely to the plane of separation betweenthe sections and disposed on opposite sides of the axis of the hub.

In testimony whereof I affix my signature in presence of two witnesses.

PHILIP MARQUA.

Witnesses:

EMIL STAREK, Jos. A. MICHEL.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

